I have this 69 SS and still finding out what is on the car. this is a photo of the pass side front of car side tube. With both wheels off the ground when you turned one forward the other turned the same direction. I counted the pinion and it turned 3 & 1/3+- for one turn of the tires. what do you think it is?
http://i668.photobucket.com/albums/vv45/WesleyTullos/DSC03331.jpg

3:31 Posi, I think the best street ratio there is.:yes:

Kent, what is the casting number?

http://www.chevellestuff.com/1969/rear_axle.htm

http://i277.photobucket.com/albums/kk75/ls7chevelle/rearaxlestamp1-1.gif

3969278NF I will load a pic later. Looks like it may be 1970 3.31 poss May 21 Balt. 1st shift?:confused:
Kent

http://i668.photobucket.com/albums/vv45/WesleyTullos/DSC03345.jpg

That casting number was used in model years 70, 71, and 72, but the CCF (3.31 ratio) code was only used in 1970. CFC was used in 71 and 72. 1969 and earlier used only a two character code: CF. There should be a casting date on one of the webs facing the rear. Should be dated shortly before May 21 and look similar to E190 (May 19, 1970).

The B indicates Buffalo, not Baltimore.

Can you find an E stamped after or under the CCF0521B1 code? Posi differentials usually had an E stamped on them.

photobucket down but D220 April 22, 1970? and CON2.
Kent

D220 April 22, 1970?
:yes: :thumbsup:

great pics btw, you must have a macro feature on your camera.

Thanks, it's a Sony Full HD 1080i Model #DSC-H7 Cybershot 8.1 megapixels along with my 16 year old son, who knows everything, ha ha, he's teaching me about technology, while I am teaching him about cars. My brilliant and beautiful wife is typing this for me while we are traveling along. I am so glad I have her she makes my life worth while. Julie